dt-bindings: clocks: at91sam9x5-sckc: convert to yaml

Convert Atmel slow clock controller documentation to yaml.

Signed-off-by: Claudiu Beznea <[e-mail]>
Reviewed-by: Krzysztof Kozlowski <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]

Documentation/devicetree/bindings/clock/at91-clock.txt

···
-Device Tree Clock bindings for arch-at91
-
-This binding uses the common clock binding[1].
-
-[1] Documentation/devicetree/bindings/clock/clock-bindings.txt
-
-Slow Clock controller:
-
-Required properties:
-- compatible : shall be one of the following:
-	"atmel,at91sam9x5-sckc",
-	"atmel,sama5d3-sckc",
-	"atmel,sama5d4-sckc" or
-	"microchip,sam9x60-sckc":
-		at91 SCKC (Slow Clock Controller)
-- #clock-cells : shall be 1 for "microchip,sam9x60-sckc" otherwise shall be 0.
-- clocks : shall be the input parent clock phandle for the clock.
-
-Optional properties:
-- atmel,osc-bypass : boolean property. Set this when a clock signal is directly
-  provided on XIN.
-
-For example:
-	sckc@fffffe50 {
-		compatible = "atmel,at91sam9x5-sckc";
-		reg = <0xfffffe50 0x4>;
-		clocks = <&slow_xtal>;
-		#clock-cells = <0>;
-	};
-

Documentation/devicetree/bindings/clock/atmel,at91sam9x5-sckc.yaml

···
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/clock/atmel,at91sam9x5-sckc.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Atmel Slow Clock Controller (SCKC)
+
+maintainers:
+  - Claudiu Beznea <[e-mail]>
+
+properties:
+  compatible:
+    oneOf:
+      - enum:
+          - atmel,at91sam9x5-sckc
+          - atmel,sama5d3-sckc
+          - atmel,sama5d4-sckc
+          - microchip,sam9x60-sckc
+      - items:
+          - const: microchip,sama7g5-sckc
+          - const: microchip,sam9x60-sckc
+
+  reg:
+    maxItems: 1
+
+  clocks:
+    maxItems: 1
+
+  "#clock-cells":
+    enum: [0, 1]
+
+  atmel,osc-bypass:
+    type: boolean
+    description: set when a clock signal is directly provided on XIN
+
+required:
+  - compatible
+  - reg
+  - clocks
+  - "#clock-cells"
+
+allOf:
+  - if:
+      properties:
+        compatible:
+          contains:
+            enum:
+              - microchip,sam9x60-sckc
+    then:
+      properties:
+        "#clock-cells":
+          const: 1
+    else:
+      properties:
+        "#clock-cells":
+          const: 0
+
+additionalProperties: false
+
+examples:
+  - |
+    clk32k: clock-controller@fffffe50 {
+        compatible = "microchip,sam9x60-sckc";
+        reg = <0xfffffe50 0x4>;
+        clocks = <&slow_xtal>;
+        #clock-cells = <1>;
+    };
+
+...